Process for surface-sizing papers with salts of reaction products of epoxides, fatty amines and polyalkyleneaminopolyamides
CA 1109976 A · Owner: Ciba-Geigy Investments Ltd. · Inventors: Topfl, Rosemarie
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for surface-sizing paper is provided. In this process the paper is impregnated with a sizing liquor and dried. The sizing liquor has a pH of 2 to 8 and contains 10-40% by weight of a salt of a reaction product which is prepared from (a) polyglycidyl ether of 2,2-bis-(4'-hydroxyphenyl)-propane (b) a monofatty amine, (c) a polyalkyleneaminopolyamine of (c') a polymerised aliphatic unsaturated fatty acid and (c") a aliphatic polyalkylenepolyamine (d) optionally an epihalogenhydrin or a nitrile of an unsaturated monocarboxylic acid and, (e) an acid in the presence of an inert organic solvent at temperatures of up to 95°C.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted September 29, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 29, 1998.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.